Exclude Sitecore templates from index

gistfile1.cs

  public class ExtendedIndexConfiguration : LuceneIndexConfiguration
  {
    private bool templatesExcluded;

    public void IncludeTemplate(string value)
    {      
      Assert.ArgumentNotNull(value, "value");
      Assert.IsTrue(ID.IsID(value), "Configuration: IncludeTemplate entry not a valid GUID. Field ID Value: " + value);
      
      // First exclude all templates, if it is not yet done.
      if (!this.templatesExcluded)
      {
        var database = Database.GetDatabase("master");
        var items = database.SelectItems("fast:/sitecore/templates//*[@@templatename='Template']");

        foreach (var item in items)
        {
          if (!DocumentOptions.IncludedTemplates.Contains(item.ID.ToString()))
          {
            ExcludeTemplate(item.ID.ToString());
          }
        }

        this.templatesExcluded = true;
      }

      this.DocumentOptions.IndexingFilters.Remove(value);
    }
  }